今天这些第一次经历继续了。Today all of these firsts keep happening.
Literally, it means today all of these first experiences continued to happen for the second time, for the third time...
So, it does not make any sense.
maybe you want to say something like,
今天我又经历了好多新鲜事(好多第一次)。(in a casual manner)
Today again, I've experienced many fresh things.
今天我的好多第一次没了。(in a playful tone)
Today many of my firsts were gone.
Today I've lost many of my firsts.
今天我又有了很多第一次的经历。(in a neutral way)
Today I continue to experience many firsts.